Marvel Comics vs Dragon Ball
Connection:
Both are very powerful and arrogant princes who hail from from a destroyed nation (Asgard for Thor and Planet Vegeta for, well, Vegeta)
Both belong to a humanoid alien race (Asgardians and Saiyans respectively)
Both were disgraced (Thor banished from Asgard for starting a war with the Frost Giants whereas Vegeta was forced to serve Frieza while his home and people were killed) but eventually redeemed themselves upon visiting Earth
Both are members of a team who are dedicated to defending the multiverse (Avengers and Z-Fighters respectively)
Both also fell in love with a human woman (Jane Foster and Bulma Briefs)
Both had rivals in their teams and fought them on several occasions (Hulk for Thor and Son Goku for Vegeta)
Both can use an energy beam that can defeat most foes (Godblast and Final Flash respectively)
Both gained an all new godly power (Thor-Force and Ultra Ego respectively)